Some groups have specific rules that vary from allowing players with no lands on their second mulligan to show their hand and draw seven cards again to simply having everyone mulligan if some of the players dont have any lands so that everyone starts on relatively equal footing
Commander is what I know best, and my lawyers say Im legally bound not to rank cards based on Constructed merit

Kaleidoscope Killers Seeing Visions Restless in Peace Eldraine Wonderland Bitterblossom Dreams Stained Glass Planeswalkers Foil Jumpstart Lands Blueprint Cards Persistent Petitioners Relentless Rats Seven Dwarves Shadowborn Apostles Slimes Against Humanity Deceptive Districts Elusive Elves Handsome Humans Surprise Slivers Zippy Zombies Step-and-Compleat Bonus Cards Secret Lair 295 Promos / Special The Hobbit: Over the Edge of the Wild 5 cards The Hobbit: Second Breakfast and Beyond 7 cards Stardew Valley: A Flicker in the Deep 7 cards Stardew Valley: Life in Pelican Town 5 cards Stardew Valley: Welcome to Stardew Valley 8 cards Their Magic is Limitless 11 cards Wild in Bloom 5 cards Marvel: Spinner Rack Specials 7 cards Cats of Chaos 5 cards Toby's Journey by Gary Baseman 5 cards Felix the Cat: Magic Bag of Tricks 6 cards Witch's Familiar 5 cards Purr Majesty 6 cards Garfield: Our Only Thought Is to Entertain You 6 cards Garfield: As Intended 6 cards Garfield: Motivationally Challenged 6 cards Back in My Day

Some decks can afford the price more easily and some decks want the effect more, judging when you have the right amount of both aspects surrounding the card will determine how good it is for you
If you like to collect cards, this is exactly what you are looking for
Racking up a significant price tag, Senseis Divining Top has long been in need of a reprint, and Mystery Booster 2 should see this terrifying toy into more players hands